If it weren’t for my usual mental acuity, I would never have found out about a secret offer at my local supermarket. It is 100% hush-hush – there are no leaflets, no ads, no-one says anything about it. Nevertheless, the offer enjoys great success. Several times each day, one lucky customer enjoys an extraordinary prize.
It always begins in a similar way: there are a lot of shoppers in the aisles, and just one cashier at the checkout. Or lots of customers and just two cashiers.